Textile apparatus



July 16, 1968 P. FORWARD 3,392,518

TEXT ILE AF PARATUS July 16, 1968 P. FORWARD 3,392,518

TEXTILE APPARATUS Filed Nov. 2, 1966 2 Sheets-Sheet 2 Maha! /mrir ArroRNEY United States Patent O TEXTILE APPARATUS Philip Forward, Macclesfield', England, assigner to Ernest Scragg & Sons Limited, Macclesfield, England -Filed No'v. 2, 1966, Ser. No. 591,532

13 Claims. (Cl. 57-77.45)

ABSTRACT or THE DISCLOSURE This invention relates to textile apparatus and more particularly to a false twist yarn tube.

In the past,.yarn which has been given a false twist has lacked strength due to-ballooning in the false twist yarn tube. Furthermore, such false-twisted yarn has not been produced at VYthe high rate of speed which modren production requires because of the lack of strength and adaptability of the apparatus for giving the yarn the false twist. Efforts to overcome these defects have not proved altogether satisfactory.

It has been found that it is possible to limit ballooning and to increase the strength of the false-twisted yarn by suitably designing the internal diameter of the false twist tube. It has also been found that, by suitably designing the false twist yarn tube and by employing a certain roller arrangement for supporting and driving the tube, high speeds of twist and of production may be obtained.

It is, therefore, an object of the invention to prevent ballooning in the false twist yarn tube. It is a further object of the invention to provide greater strength in the false-twisted yarn. Another object of the invention is to provide an apparatus for producing such false-twisted yarn at a higher rate of speed than has heretofore been possible.

According to the invention a false twist yarn tube is provided having a maximum internal diameter of 0.04 inch over at least a part of the length of said tube in order to limit ballooning of a yarn in the twist tube so that yarn deterioration is materially prevented. Furthermore, the form of false twist yarn tube is preferably so designed that the tube has a central cylindrical portion and cylindrical end portions of a diameter greater than that of the central portion for positioning the tube axially within a supporting arrangement, The supporting and driving arrangement preferably includes pairs of rollers upon and between which the twist yarn tube is placed, without attachment thereto.

In a preferred embodiment, the supporting and driving arrangement is capable of rotating the false twist yarn tube at a speed of 400,000 r.p.m. and over.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIG. 1 is an elevation of one embodiment of the invention;

. Patented July 16, 196s F IG. 2 is an elevation, partly broken away and in midsection of another embodiment of the invention;

FIG. 3 shows on a larger scale a fragmental elevation of the end portion of the tube illustrated in FIG. 2, the portion being shown in partial mid or axial section and viewed at with respect to the showing of FIG. 2; and

FIG. 4 is an end view of the embodiment shown in FIG. 2, as seen from above in that figure.

FIG. 1 illustrates a false twist tube 11 constructed and arranged .according to the invention. The tube 11 has an end portion 13 and an oppositely disposed end portion 14 of equal mass in order to balance the tube during rotation. The end portion 13 has a cavity 15 therein adapted to receive an insert member 16 carrying a twist locking device 17, which in this instance is a twist pin of sapphire or other hard material. The insert member 16 is preferably of nylon which is molded and resilient. The cavity 15 is formed by swaging or spinning the ends of the tube 11 to increase its diameter, and the cavity is of conical form, converging towards the end of the tube 11. Thus, the insert 16 is compressed within the cavity'15 where it is retained firmly when the deforming forces are released.

FIG. l illustrates the tube 11 positioned axially in a supporting structure which may also be a driving structure. As here shown, the supporting structure comprises three pairs of rollers 18 mounted on three parallel shafts 19. By rotating the shafts 19, it is possible to rotate the tube 11 at the desired speed. The end portions 13 and 14 of the false twist tube 11 comprise conical parts 13a and 14a, respectively, diverging outwardly away from the cylindrical center portion 12 of the tube. Thus, the end portions 13 and 14, by making contact with the outermost rollers 18, maintain the tube 11 in the supporting structure.

FIG. 2 shows the tube 11 carried by two supporting rollers 28, which may be driving rollers. Clearly, an additional roller 28 might contact the cylindrical center portion 12 of the tube as does the center roller 18 illustrated in FIG. l. However, it is to be noted that FIG. 2 illustrates magnetic means 29 surrounding the portions of greater diameter 13 and 14 at opposite ends of the tube 11 for maintaining the tube upon the rollers and for preventing axial movement thereof.

FIGS. 2, 3 and 4 illustrate an embodiment in which the tubular member 11' has a tubular insert 21 of an internal diameter of 0.04 inch extending therethrough. The outer end of the tubular insert 21 is positioned as closely as possible to the twist locking device 17 while permitting yarn to be threaded on said device. In order to provide greater side clearance at this point, the end 22 of the tube 21 may be reduced in external diameter by drawing. It will be seen in FIGS. 3 .and 4 that the twist pin 17 is set slightly 0H center sothat the yarn 23 emerging from the tube 21 does not bend out of the axial position at the edge of the tube 21. Thus, the tube 21 does not apply any appreciable friction upon the yarn.

Although a continuous internal diameter of the false twist tube 11 and the tubular insert 21 are shown, it is recognized that such may not necessarily be the case with all types of yarn in order to limit ballooning and prevent yarn deterioration.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of false twist apparatus differing from the types described above.

While the invention has been illustrated and described as embodied in a false twist yarn tube of specified internal diameter and a certain type of roller arrangement for supporting and driving the tube, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

\What is claimed as new and desired to be secured by Letters Patent is:

1. In a textile apparatus, the combination comprising drive means adapted to rotate an elongate tubular member at speeds of at least 370,000 r.p.'m.; and an elongated tubular member operatively associated with said drive means for rotation thereby, said tubular member constituting a false twist tube provided with a bore for passage of a yarn therethrough and bounded by an inner surface, and said bore having an inner diameter of at most 0.04 inch whereby ballooning of the yarn passing through said bore is limited and deterioration of such yarn resulting from frictional contact thereof with said inner surface is prevented.

2. In apparatus as defined in claim 1, said tubular member including a tubular insert having said internal diameter and being disposed `axially within said tubular member.

3. In apparatus as defined in claim 1, further including ya twist locking device at one end of said member.

4. In apparatus as defined in claim 3, wherein said twist locking device is -a pin of hard material.

5. In apparatus as dened in claim 4, wherein said twist locking device is a sapphire pin.

6. In apparatus as defined in claim 1, wherein one end of said member has a frusto-conical cavity therein converging toward the outer end of said member, an insert support member is disposed in the cavity, and a twist locking device is carried by said insert support member.

7. In apparatus as defined in claim 6, wherein said insert support is resilient and compressed within said cavity.

8. In apparatus as defined in claim 7, wherein said insert support member is a molded nylon body.

9. In apparatus as defined in claim 1, said member having a central cylindrical portion and cylindrical end portions of a diameter greater than that of the central portion for positioning the member axially within a supporting structure.

10. In apparatus as defined in claim 9, wherein said end portions comprise conical parts diverging outwardly away from said central portion.

11. In apparatus as defined in claim 1, yfurther comprising a roller arrangement for supporting said member.

12. In apparatus as defined in claim 11, wherein said roller arrangement comprises rollers mounted on three parallel shafts.

13. In apparatus as defined in claim 11, wherein said member is of magnetic material, and said roller arrangement includes magnetic means for maintaining the member in contact with the rollers.

References Cited UNITED STATES PATENTS 2,855,750 10/1958 Schrenk et al. 57-77.45 XR 2,949,721 8/1960 Van Dijk 57-77.3 XR 2,991,614 7/1961 Ubbelohde 57-77.3 XR 3,115,743 12/1'963 Brodtmann 57-77.45 3,123,969 3/1964 Noordenbos 57--77.45 3,142,953 8/1964 Gassner et al. 57-77.45 3,152,436 10/1964 Dudzik et al. 57--77.45 XR 3,232,036 2/1966 Seragg 57-77.3 3,232,037 2/ 1966 Crouzet 57-77.45 3,233,398 2/1966 Gilcrist 57-77.45 XR 3,267,657 8/1966 Kunzle et al. 57-77.45

FRANK J. COHEN, Primary Examiner.

DONALD E. WATKINS, Examiner. 

